Which of the following statements can be directly inferred from the above passage?

Questions are based on the following passages.

            The belief that the Africans brought to London
            to be sold into slavery were at the time in a
            more or less primitive stage of uncivilized life;
            pales in comparison to the methods used to
(5)        capture and transport them to this "land of the
            free and home of the brave". The details,
            brought forth through vivid pen pictures,
            indicate the demoralizing and debasing effects
            of the "system" from its initial period, followed
(10)       up by the blighting influences of slave life, even
            under the most favorable conditions, for nearly
            two hundred and fifty years. This left upon their
            lives and character just the traits it would have
            left upon any other people subjected to similar
(15)       conditions for the same length of time.
            The argument that slavery gave the African
            some of the arts of civilized life; while denying
            him the inalienable rights of manhood, denying
            him the right to the product of his labor, does
(20)       not hold water as it left him no noble incentive to
            labor at these arts, and thus tended to render him
            improvident, careless, shiftless, in short, to
            demoralize his entire nature.